Bµi gi¶ng m«n häc c«ng nghÖ khung vá «t« H×nh vÏ – bµi H3.1 H3.3 H3.2 H3.4 H3.5 H3.6 H3.7 H3.8 H3.9 H3.10 H3.12 H3.11 H3.13 H3.14 H3.15 H3.17 H3.18